Err. Id consider a 1m+ offer if I were him. With explosion of tlds and AI making the domain name less relevant (you ask AI and click its link) it will probably depreciate and better to grab $$$ and invest elsewhere.
Not on the same scale as AI, but my first ever AirBnB host still owns harley.com. He made his money writing "The Yellow Pages of the Internet" physical books and had turned down numerous lucrative offers from Harley Davidson.
Really fascinating and quirky guy as you can probably infer from the site.
Artificial Insemination is a massive global industrial SaaS (Sperm as as Service), one of the few sectors that can literally make its customers' clients come and deliver!
Also the server header is "lactoserv"